<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<link rel="stylesheet" href="a.css" media='screen and (max-width:1200px)'  />
		<link rel="stylesheet" href="b.css" media='screen and (min-width:1201px)'  />
	</head>
	<body>
	</body>
</html>
